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개량박막 유한요소법에 의한 두가지 블랭크로부터의 사각컵 딥드로잉 성형해석
허훈,한수식,Huh, Hoon,Han, Soo-Sik 대한기계학회 1994 대한기계학회논문집 Vol.18 No.10
The design of sheet metal working processes is based on the knowledge about the deformation mechanism and the influence of the process parameters. The typical geometric process parameters are the die geometry, the initial sheet thickness, the initial blank shape, and so on. The initial blank shape is of vital importance in the most sheet metal forming operations, especially in the deep drawing process, since the forming load and the strain distribution are significantly affected by the shape of an initial blank. The influence of the initial blank shape on a square cup deep drawing process is investigated by the numerical simulation and the experiment. The numerical simulation is carried out by a modified membrane finite element method which takes bending deformation into account. The numerical and experi-mental results show that the initial blank shape have strong influence on the forming load and the strain distribution. The numerical results are compared with the experimental results and other numerical results which are calculated with the membrane theory.
[구조강도부문] 인장형 홉킨슨 바의 오차 분석 및 자동차용 냉연강판의 고속인장 특성 연구
강우종(Woo-Jong Kang),허훈(Hoon Huh),한수식(Soo-Sik Han) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The dynamic behavior of vehicle body materials is dependent on material strain rates. In high speed tensile test of sheet metals, a new tension split Hopkinson bar specially designed for sheet metals is used. The tension split Hopkinson bar has some sources of errors such as grips and the plate type specimen. In this paper, these errors estimated and minimized. The results from both quasi-static and dynamic tests show that the strain rate hardening effect for sheet metals can not be described by the original Johnson-Cook constitutive relation. This relation has been modified to include a higher-order term for the hardening effect.